Method of measuring pressure by means of a pressure gauge having a resonant element
US6615664B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 22, 2002 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | Jan 22, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/0019
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention relates to a method of measuring pressure in which an evacuated capsule (1) containing a resonant element (5) is placed in the fluid whose pressure is to be measured, a vibration characteristic of the element is measured, and the pressure is deduced from said characteristic. A resonant element is used which, during measurement, is to be found in a stress state that is close to buckling. For this purpose, it is possible to use heater means for heating the element and servo-controlled so as to keep the frequency of vibration thereof constant. The resonant element can be made of silicon. The invention is particularly applicable to oil wells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.